50. A protein is
(A) polysaccharide
(B) a saturated ester of glycerol
(C) one of the units composing a nucleic acid
(D) a polymer
of amino acid units
(E) an aromatic hydrocarbon with a fused ring structure

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統計: A(0), B(0), C(0), D(1), E(0) #3371135

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